Comment by gjulianm

If it only were Persona the thing that failed... But I've seen quite a lot of attempts at federated identity and turns out people don't care too much about that. People just want to login to whatever site to do things. Login with Twitter/FB/whatever is offered to reduce login friction, not because people think of them as identity providers. Offering "another identity provider" is solving the part of the problem most users really don't care for.